#Circle

 draw.circle(...)

function draws a circle on the plot. It's usage is:

draw.circle(x,y,radius,nv=100,border=NULL,col=NA,lty=1,lwd=1)

x,y

: Circle center coordinates

radius

: Circle radius

nv

: Number of vertices

border

: Border Color

col

: Fill Color

lty

: Line type

lwd

: Line width
draw.circle requires "

plotrix

" package, to install:

>install.packages("plotrix")

for #Example

install.packages("plotrix")
plot(BOD)
require(plotrix)
draw.circle(4,14,2,border="blue",col="tan2")

@R_Experts